const INTROSPECTION_PROPS = new Set(["$$typeof", "nodeType", "then"]);

/**
 * Handles common proxy introspection properties.
 * Returns the appropriate value for toStringTag, toJSON, and props that should return undefined.
 * Returns `false` if the prop should be handled by the subclass.
 */
export const handleIntrospectionProp = (
  prop: string | symbol,
  name: string,
): unknown | false => {
  if (prop === Symbol.toStringTag) return name;
  if (typeof prop === "symbol") return undefined;
  if (prop === "toJSON") return () => name;
  if (INTROSPECTION_PROPS.has(prop)) return undefined;
  return false;
};

export abstract class BaseProxyHandler implements ProxyHandler<object> {
  abstract get(_: unknown, prop: string | symbol, receiver?: unknown): unknown;
  abstract ownKeys(): ArrayLike<string | symbol>;
  abstract has(_: unknown, prop: string | symbol): boolean;

  getOwnPropertyDescriptor(_: unknown, prop: string | symbol) {
    const value = this.get(_, prop);
    if (value === undefined) return undefined;
    return {
      value,
      writable: false,
      enumerable: true,
      configurable: false,
    };
  }

  set() {
    return false;
  }
  setPrototypeOf() {
    return false;
  }
  defineProperty() {
    return false;
  }
  deleteProperty() {
    return false;
  }
  preventExtensions(): boolean {
    return false;
  }
}